feat: add routes, lang, tests, stubs, docs, and docker configurations

docker/mysql/create-testing-database.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+mysql --user=root --password="$MYSQL_ROOT_PASSWORD" <<-EOSQL
+    CREATE DATABASE IF NOT EXISTS testing;
+EOSQL
+
+if [ -n "$MYSQL_USER" ]; then
+mysql --user=root --password="$MYSQL_ROOT_PASSWORD" <<-EOSQL
+    GRANT ALL PRIVILEGES ON \`testing%\`.* TO '$MYSQL_USER'@'%';
+EOSQL
+fi